Fix mermaid diagram height when initially hidden (#32457)

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Fix mermaid diagram height when initially hidden (#32457) #32464

Closed GiteaBot closed 1 week ago

GiteaBot commented 1 week ago

Backport #32457 by @silverwind

In a hidden iframe, document.body.clientHeight is not reliable. Use IntersectionObserver to detect the visibility change and update the height there.

Fixes: https://github.com/go-gitea/gitea/issues/32392